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y A. E. JOHNSON. WORK OLAMPI-NG AND GHANNEL CUTTING DEVICE FOR SEWING MACHINES.

No. 547,169. Patented 001;. 1,18%]

ANDREW B.GRM1AM.PNUTO'UTHQWASNINGTOMDQ L (No Model!) 3 Sheets-Sheet A. "E. JOHNSON. 'WORK'GLAMPING AND CHANNEL CUTTING DEVIGE FOR SEWING MAGHINES.

110541169. Patented Oct. 1,1895

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A. E. JOH SON.

WORK CLA'MPING AND CHANNEL CUTTING DEVICE I'CR SEWING MACHINES.

N0.547,169@ I PatentedO0t.1,1895.'

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NlTED STATES ALBERT E. JOHNSON, OF BROOKTON,

MASSACHUSETTS, ASSIGNOR o run WORK-CLAMPING AND CHANNEL-CUTTING DEVICE FOR SEWING-MACHINES.

SPECIFICATION forming part of LettersP atehtNo. 547,169, dated October 1, 1895.

Application filed team. 9, 892,

To all whom it may concern:

Be it known that I, ALBERT E. JOHNSON, of Brockton, in the county of Plymouth and State of Massachusetts, have invented a new and useful Work-Clamp and Channel-Gutter for Sewing-lVIachines, of whichthe following is a specification, reference being had to the accompanying drawings, in which- Figure 1 is a front elevation, and Fig. 2 a side elevation,partly in section, illustrating my invention as applied to the well-known Campbell lock-stitch wax-thread sewing-machine; Fig. 3, a diagram in plan, showing the throat-plate and channel-knife and their relations to the needle. Figs. 4, 5, and 6 are sectional diagrams on the corresponding lines on Fig. 3. Fig. 7 is a plan of the adjustable support for the cutter.

The work-clamp in ordinary sewingmachines is composed commonly of a presserfoot and a work-plate or throat-plate, and the moving memberjs usually called the presser' foot; but in some cases both members move as, for example, in Patent No. 444,895, dated January 20, 1891, granted to Cyrus H. Porter and myselfand in that case either member may be called the presser-foot or the throat-plate.

My invention is a work-clamp, one member of whichnamely, that member which acts on that surface of the sole or other material to be stitched, commonly called the work, in which the channel is cut-is formed with a bearing-surface at one side of the channel in advance of the needle and also with a bearing-surface across the channel in rear of the needle.

In the drawings I have shown my workclamp and channel-cutter applied to the Campbell lock-stitch waxthread sewing machine. Y

A indicates the arch, which contains the shuttle, and B the head.

The workclamp is composed of the throatplate a and presser'foot b. The throatplate a is fast to the upper surface of the arch A, and the presser-foot is connected to its bar, all as usual. As that surface of the work in which the channel is out is pressed against the upper surface of the throat-plate, the

throat-plate in front of the needle has no bear- Serial 110454569. (No model.)

ing-surface whichlies across the channel, but in rear of the needle has a bearing-surface which extends across the channel, the absence of the bearing surface in. front of the needle allowing the channel-flap to project, as in Fig.

5, While the bearing surface in rear of the needle closes the channel by turning the channel-fiap into place as the work is fed along and crowding the channel-flap into place as the work is clamped between the presser-foot and throat-plate-that is, by the two members of the work-clamp, as shown in Fig. 6. It will now be clear that this feature of my invention is applicable to all sewing-machines for sewing in a channel, whether the channel be cut and the flap turned aside before the work is put into the sewing-machine or whether cutting the channel and turning aside the flap be done in the sewing-machine, as in Patent No. 444,895, for the channel-cutter and flapturner d is in substance the same as the knife and shear of that patent. This feature of my invention consists in the new work-clamp, one member of which is especially adapted to bear on the channeled surface and with a bearing-surface extending parallel with the line of feed at one side of and in front of the needle and across the line of feed at the rear of the needle, as will be plain from Fig. 3, in which a is that part of the bearing-surface which supports the work against the thrust of the awl, but is so shaped as to allow the channel-flap to project, while a is that part of the bearing-surface which turns the flap into place and forces it into place when the Work is clamped. When the channel is out and its flap turned aside in the sewing-machine, the throat-plate a must also be recessed to allow the tool 01 to make its stroke, and this combination of my work-clamp and such a tool is also a feature of my invention. In Fig. 3 the tool d is shown in full lines at one extreme position and in dotted lines at the other.

A third feature of my invention is the adjustable support f (shown in plan in Fig. 7) for the tool d. The tendency is forthe'toold to spring away from the work, so that the channel will not be out quite so deep in hard leather as in softer leather, and this support 1, when properly adjusted, prevents the springing away of the tool cl, thereby making channels of uniform depth in all kinds of work. In that example of myinvention shown in the drawings the tool 61 is held by screw 01 to toola holder d and is adjustable on tool-holder d in the usual way by a slot in the shank of tool 65. Tool-holder d is adjustable on car rier d in the same Way, being" held to carrier d by the screws d Carrier 01 is fulcrumed on stud d which is fast to the front of the arch A. The tang of carrier d is connected by link d with one arm of rock-shaft 62 which is actuated by its other arm engaging a cam in the usual Way. The stroke of carrier d is adjusted by varying the connections at one: or both ends of link d, as will be clear.

What I claim as my invention is 1. In a sewing machine for stitchingin a,

channel, in combination the needle; a work clamp one member of which is provided with a wide bearing surface a in rear of the needle, and a narrow bearing surface a, at the side and in front of the needle; and a tool to cut the channel and turn the flap aside; all arranged andoperating substantially as and for the purposes set forth.

2. In asewing machine, in combination with the work clamp a b, and the vibrating channel cutting tool d, the support f, adjustably mounted in the machine as an adjustable bearing surface for the shank of tool 6?; substantially as set forth.

ALBERT E. JOHNSON.

Witnesses:

J. E. MAYNADIER,

JOHN R. SNOWV. 

